• Which Products are you interested in ?

    CST offers a wide range of EM simulation software to address design challenges across the electromagnetic spectrum, from static and low frequency to microwave and RF, for a range of applications, including EDA & electronics, EMC & EMI and charged particle dynamics.

  • Antenna Magus
  • IdEM
  • FEST3D
  • Optenni Lab
  • Looking for a Training, Workshop or eSeminar ?

    CST STUDIO SUITE® is being demonstrated at trade shows and workshops all over the world. Take a look at the list of conferences and exhibitions CST will be attending and get further information regarding CST workshops, eSeminars and training days.

  • TrainingsRegular training courses are held in CST's offices in Asia, Europe, and North America. Please check our trainings section for detail of trainings in all over the globe. Advance registration is normally required.

  • WorkshopsCST hosts workshops in multiple languages and in countries around the world. Workshops provide an opportunity to learn about specific applications and refresh your skills with experienced CST support staff. Make sure you visit our workshop section.

  • eSeminarsThroughout the year, CST simulation experts present eSeminars on the applications, features and usage of our software. You can also view past eSeminars by searching our archive and filtering for the markets or industries that interest you most.

  • Check our latest Events
  • Why create a MyCST Account ?

    A MyCST account may facilitate your access to many of the offerings on the CST website, for example the registration for eSeminars and the watching of eSeminars recordings, setting email preferences, and there is more functionality to come. It is required to participate in workshops and trainings.

  • Personal PreferencesAllows you to update your email preferences and areas of interest. It helps us to personalize your experience.

  • EventsSearch for events by location, industry and application. Once you are registered, you will be able to manage your registrations and check important details about your events. This section also provides you with a repository for Workshop & Training material.

  • LibraryYou can collect articles you find on the CST website to reference or read later by clicking on the “Add this article” button at the bottom of the article page.

  • Create Your Own Account
  • Need technical Support ?

    Customers can customize their accounts once they have completed the account creation process. This platform acts as vivid interface between CST and our customers.

    We therefore offer access to the latest Service Packs (including an automatic notification that a new Service Pack is available), a steadily growing database of Frequently Asked Questions (FAQs), Application Notes and Training Videos, as well as an individual FTP section for easy exchange of large files with our support team.

  • Do I need an Account?To access the Support Site a valid maintenance contract and a one-time registration is required.

    Please note that your Support login does not work for the MyCST account.

  • Get Support
  • How to request a Trial License ?

    Get your license in only three steps:

    1. Fill in the required fields in the contact form on the right and click "Send Us Your Request".

    2. Lean back and wait until one of our CST Experts contacts you.

    3. Enjoy a our trial license.

  • Student Edition

    Student Edition The CST STUDIO SUITE® Student Edition has been developed with the aim of introducing you to the world of electromagnetic simulation, making Maxwell’s equations easier to understand than ever. With this edition you have, bar some restrictions, access to our powerful visualization engine and some of the most advanced solvers of CST STUDIO SUITE.

    Student Edition

CST – Computer Simulation Technology

Thermal Modeling of Heat Sinks

Efficient thermal management is critical for many electronic applications, and is a standard part of the design for components such as power electronics modules, multichip modules (MCM) and systems-on-packages (SOP). Heat sinks serve to transfer the generated heat of an electronic system away from the active and passive electronic components and toward the ambient environment. Temperature distributions and heat flows can be efficiently simulated using CST MPHYSICS® STUDIO (CST MPS). CST MPS offers both stationary and transient thermal simulation capabilities.

Figure 1: Heat sink with heat source

A heat sink carrying a heat source is shown in Figure 1. To model the interaction of the heat sink with the ambient environment, surface properties in terms of emissivity e (radiation) and heat transfer coefficient ...

h (convection) are assigned to the heat sink surface. For natural convection, h = 5 W/(m2·K) is a typical value.

Figure 2: Stationary heat spreading due to multidimensional conduction

Figure 2 shows the heat flow density. This is a measure of the spread of heat within the heat sink, and is related to the temperature distribution in Figure 3 by Fourier’s law.

Figure 3: Stationary temperature distribution of the heat sink, with measurement locations highlighted

The thermal simulation of the heat sink in Figure 1 was carried out assuming a thermal heat source of 21 watts. The results from this simulation were then compared with measurement results [1] at selected points on the heat sink, shown in Figure 3. The simulated and measured results are summarized in Table 1.

T1 / °C T2 / °C T3 / °C T4 / °C
Simulation 65.6 65.6 66.6 71.0
Measurement 66.3 65.7 67.8 69.8

Table 1: Measured and simulated temperatures at selected points

An excellent agreement was achieved, especially given the uncertainties of the measurements and the simulation. The simulation using the stationary thermal solver with a tetrahedral mesh took less than 2 minutes on a 2.67 GHz laptop with 4 GB RAM.


[1] Courtesy of Robert Bosch GmbH


The work described in this paper has received funding from the Federal Ministery of Education and Research under grant agreement no. 16N10943 (SOlar project).

Rate this Article

0 of 5 Stars
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
contact support

Your session has expired. Redirecting you to the login page...

We use cookie to operate this website, improve its usability, personalize your experience, and track visits. By continuing to use this site, you are consenting to use of cookies. You have the possibility to manage the parameters and choose whether to accept certain cookies while on the site. For more information, please read our updated privacy policy

Cookie Management

When you browse our website, cookies are enabled by default and data may be read or stored locally on your device. You can set your preferences below:

Functional cookies

These cookies enable additional functionality like saving preferences, allowing social interactions and analyzing usage for site optimization.

Advertising cookies

These cookies enable us and third parties to serve ads that are relevant to your interests.